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4/21/2014 3:17:27 AM


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T568A and T568B Wiring Schemes -- What's the Difference?

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T568 A or T568 B Wiring Schemes- What's the Difference?

Based on TIA/EIA-568-B.1-2001, the T568A and T568B wiring schemes define the pinout, or order of connections, for wires in eight-pin modular connector plugs and jacks.

The only difference between T568A and T568B is that pairs 2 and 3 (orange and green) are swapped. Both configurations wire the pins "straight through", i.e., pins 1 through 8 on one end are connected to pins 1 through 8 on the other end, and the same sets of pins are paired in both configurations: pins 1 and 2 form a pair, as do 3 and 6, 4 and 5 and 7 and 8.

Cables that are terminated with differing standards on each end will not function normally, however mixing T568A-terminated patch cords with T568B-terminated horizontal cables (or the reverse) will not produce pinout problems in a facility, although it may slightly degrade signal quality, This effect is marginal and certainly no greater than that produced by mixing cable brands in-channel.

T568 A or T568 B- Which One Should I Use?

  • If the installation is residential, choose T568A unless other conditions apply (see below).
  • If there is pre-existing voice/data wiring (remodel, moves, adds, changes), duplicate this wiring scheme on any new connection.
  • If project specifications are available, use the specified wiring configuration.
  • If components used within the project are internally wired either T568A or T568B, duplicate this wiring scheme.

T568A and T568B Wiring Assignments:

T568A and T568B Wiring Assignments
Wiring Standards
Pin # T568B T568A
1 White/Orange White/Green
2 Orange Green
3 White/Green White/Orange
4 Blue Blue
5 White/Blue White/Blue
6 Green Orange
7 White/Brown White/Brown
8 Brown Brown


This specification applies to typical twisted pair network cabling including Category 5E (CAT5E) and Category 6 (CAT6).

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